Leverkusen can create a fantastic record this season, and I think this season will be a difficult season for them to forget because this season is the first time they have become champions in the Bundesliga with a record without defeats too. Xabi Alonso really made this club play extraordinary, despite their failure in the Europa League because they lost in the final match.
Next season they will be in the Champions League, and actually that's what I'm looking forward to. Even though we have seen their defeat this season for the first time, it still makes me curious about what they will show next season. Next season they will also get new ammunition, because I think Xabi Alonso also needs some additions to his squad to be even stronger. We'll see what they are like next season, whether they can show like this season, but I hope so.
Usually when a strong team that rarely lose, but they're lose in important match, their performance will keep declining and become mediocre (see Liverpool). Maybe Leverkusen will follow Liverpool's path since Leverkusen is one season wonder team, black horse team really rare can being consistent for more than one season (see Napoli).
The upcoming match DFB Pokal is against weak team, so Leverkusen will not have any problem, we will see their performance in friendly match.
But it seems, if for example Bayern Munich doesn't get the right coach next season, then maybe Bayer Leverkusen will still be able to win the Bundesliga trophy again next season. I think this could happen, considering that it seems like Bayern Munich also has internal problems which are likely to be difficult for them to overcome, especially regarding the right coach for Bayern Munich next season. That way, it is very likely that teams like Dortmund, Leipzig and Suttgart will also be better next season. Ofcourse,it would be interesting if Bayern Munich failed to dominate the league, because with Bayern Munich still in chaos it would give other teams in the Bundesliga have the chance to win the Bundesliga trophy.